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How to sort HashSet in Java
To sort HashSet in Java, you can use another class, which is TreeSet.
Following is the code to sort HashSet in Java −
Example
import java.util.*;
public class Main {
public static void main(String args[]) {
Set<String> hashSet = new HashSet<String>();
hashSet.add("green");
hashSet.add("blue");
hashSet.add("red");
hashSet.add("cyan");
hashSet.add("orange");
hashSet.add("green");
System.out.println("HashSet elements
"+ hashSet);
Set<String> treeSet = new TreeSet<String>(hashSet);
System.out.println("Sorted elements
"+ treeSet);
}
}Output
HashSet elements [red, orange, green, blue, cyan] Sorted elements [blue, cyan, green, orange, red]
Let us see another example wherein we will sort the HashSet in descending order using Collections.sort() method with reverseOrder() method −
Example
import java.util.*;
public class Main {
public static void main(String args[]) {
Set<String> hashSet = new HashSet<String>();
hashSet.add("yellow");
hashSet.add("green");
hashSet.add("blue");
hashSet.add("cyan");
hashSet.add("orange");
hashSet.add("green");
System.out.println("HashSet elements
"+ hashSet);
List<String> myList = new ArrayList<String>(hashSet);
Collections.sort(myList,Collections.reverseOrder());
System.out.println("Sorted (descending order)
"+ myList);
}
}Output
HashSet elements [orange, green, blue, yellow, cyan] Sorted (descending order) [yellow, orange, green, cyan, blue]
Updated on: 20-Sep-2019
1K+ Views
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